libfreeimage: add patch to fix x86 build problem

Add a patch to fix an x86 build problem caused by invalid register
usage when -fPIC is used.

Fixes:

  http://autobuild.buildroot.org/results/fe7/fe72243a84a91b68ef3138847294674b36f16c58/



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>